Go easy on me chaps
Had a late call out last night. Customer reported shock on non electrical shower unit. Has previously had another electrician come to property who added some supplementary bonding but know refuses to come back to property and they have also had U.K Power come out to check earthing which they reported as fine, they did a few other tests and the only thing they could suggest it maybe is a fault from an adjoining property to customers pipework. This doesn't point to the issue for me as although the voltage is intermittent it is only present when customers lighting circuit is on. My first point of call was to check bonding was adequate and used wander lead from shower pipework to disconnected bonding conductors and both was below 0.05ohms. Because of limited time, access around property as some rooms rented to tenants also on my part insufficient lighting to provide while lighting disconnected I made a bit of a hash on what I think should of been next testing procedures i followed. In hindsight I think my next port of call should of been to follow crippler. I should of identified correct lighting cpc and line R1 + R2 as far into circuit as could with limited access to areas of property. Once this was done then ir tested either with all dimmers off or with L and N to c.p.c. To note I did get a reading of 0.35M ohms on lighting line to a cpc at board but this wasn't at correct earthing terminal for circuit. Because of limited time again and lighting levels I didn't manage to get a true voltage to earth reading on pipework. How would you suggest this is best done? My thinking is that it wander lead from pipework to any other part of earthing other than main incoming earth I won't achieve this. So would need to isolate all circuits other than lighting disconnect main earth and test to this? The main thing I'm failing to see at moment is if bonding is indeed adequate and lighting circuit is rcd protected why would it not trip. They have mentioned that they are having a daily battle with mice but again if munched through cable this should trip it? At least when in contact with earth. One thing to note as well is that voltage detector is picking up voltage on groat work near shower unit and they haven't ever reported getting a shock before using shower it only seems to become present once the shower has been in use. Any point in right direction would be appreciated like I said they have had a few people round and no-one seems to be getting to bottom of it.
Had a late call out last night. Customer reported shock on non electrical shower unit. Has previously had another electrician come to property who added some supplementary bonding but know refuses to come back to property and they have also had U.K Power come out to check earthing which they reported as fine, they did a few other tests and the only thing they could suggest it maybe is a fault from an adjoining property to customers pipework. This doesn't point to the issue for me as although the voltage is intermittent it is only present when customers lighting circuit is on. My first point of call was to check bonding was adequate and used wander lead from shower pipework to disconnected bonding conductors and both was below 0.05ohms. Because of limited time, access around property as some rooms rented to tenants also on my part insufficient lighting to provide while lighting disconnected I made a bit of a hash on what I think should of been next testing procedures i followed. In hindsight I think my next port of call should of been to follow crippler. I should of identified correct lighting cpc and line R1 + R2 as far into circuit as could with limited access to areas of property. Once this was done then ir tested either with all dimmers off or with L and N to c.p.c. To note I did get a reading of 0.35M ohms on lighting line to a cpc at board but this wasn't at correct earthing terminal for circuit. Because of limited time again and lighting levels I didn't manage to get a true voltage to earth reading on pipework. How would you suggest this is best done? My thinking is that it wander lead from pipework to any other part of earthing other than main incoming earth I won't achieve this. So would need to isolate all circuits other than lighting disconnect main earth and test to this? The main thing I'm failing to see at moment is if bonding is indeed adequate and lighting circuit is rcd protected why would it not trip. They have mentioned that they are having a daily battle with mice but again if munched through cable this should trip it? At least when in contact with earth. One thing to note as well is that voltage detector is picking up voltage on groat work near shower unit and they haven't ever reported getting a shock before using shower it only seems to become present once the shower has been in use. Any point in right direction would be appreciated like I said they have had a few people round and no-one seems to be getting to bottom of it.
